CN106751773B - Magnetic material system for magnetic locking structure packaging box - Google Patents
Magnetic material system for magnetic locking structure packaging box Download PDFInfo
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- CN106751773B CN106751773B CN201611113549.7A CN201611113549A CN106751773B CN 106751773 B CN106751773 B CN 106751773B CN 201611113549 A CN201611113549 A CN 201611113549A CN 106751773 B CN106751773 B CN 106751773B
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
Abstract
The invention relates to a magnetic locking packaging structure and a magnetic material system thereof. The method comprises the following steps: the packaging box cover and the box body with weak magnetism are obtained by adopting anisotropic permanent magnetic ferrite magnetic powder, a reinforcing material and high polymer resin to prepare a permanent magnetic composite material after melting and mixing, injection molding and orientation and magnetization along the locking direction. The packaging box cover and the packaging box body manufactured by the invention have weak unidirectional magnetism, but can generate enough locking force in the locking direction after being locked; compared with the traditional ferromagnetic material (such as NdFeB permanent magnetic material), the material and the product designed by the invention can not generate a local high-strength magnetic field, avoid influencing surrounding objects, and save rare earth resources; in addition, the product of the invention can be formed by one-time injection, and has the advantages of high production efficiency and low cost.
Description
Technical Field
The invention belongs to the field of bonded magnetic composite materials, relates to a magnetic composite material suitable for injection molding, and particularly relates to a magnetic material system for a magnetic locking structure packaging box.
Background
Along with the development of the trend of life rapidness and convenience, some daily necessities packing boxes also become simple and easy to open and close, and some packing boxes which are locked and fixed by threads or buckles are gradually changed into magnetic attraction. Such as lipstick packaging: the box body is made of plastic injection molding, a magnetic ring (such as patent CN 203662193U) made of strong magnetic material (such as neodymium iron boron and other metal permanent magnetic materials) is arranged at the position, close to the inlet, of the box body, and then the box cover is made of paramagnetic material, so that the attraction effect can be achieved (as shown in attached figure 1). Although the structural box material can also play a role in locking and attracting, the following problems exist in the product: firstly, the price of the ferromagnetic materials such as neodymium iron boron is high, and the metal materials are easy to corrode and need to be electroplated or sprayed with a protective layer; secondly, the process is complex, the magnetic ring and the box body need to be assembled subsequently, and the assembly is easy to be failed due to size deviation; thirdly, the strong magnetic material is easy to locally generate a magnetic field, and influences are generated on adjacent objects. Therefore, the invention designs a novel weak magnetic material system, and a final product can be obtained after injection molding and orientation magnetization (as shown in the attached figure 2 in the specification). The weak magnetic material system is an injection ferrite material, has low price and corrosion resistance, and can be molded by one-time injection to obtain a final product; in addition, the injection ferrite magnetic material system has relatively weak magnetism, after the injection ferrite magnetic material system is magnetized in the vertical direction, the box cover and the box body can generate strong attraction in the locking direction, and the influence of a magnetic field generated by the box cover and the box body on surrounding objects is small.
The method comprises the steps of firstly carrying out surface treatment on micron-sized ferrite magnetic powder by using a coupling agent, then uniformly mixing the micron-sized ferrite magnetic powder with high molecular resin, reinforcing fibers and a lubricant, and carrying out mixing granulation by using a double-screw extruder to prepare the polymer-based ferrite magnetic composite material. The composite material is subjected to injection molding, orientation and magnetization to obtain a box body and a box cover of the packaging box. The invention has the characteristics of high production efficiency, low cost, high mechanical strength of products, corrosion resistance, high magnetic locking force and the like; and the production process is simple to operate and easy for industrial production.
Disclosure of Invention
The invention aims to provide a high-strength and weak-magnetism magnetic locking packing box and a polymer-based magnetic composite material used by the packing box; and the polymer-based ferrite magnetic composite material is subjected to injection molding, orientation and magnetization to obtain the packaging box locked by magnetic force, wherein the magnetization direction is along the direction vertical to the locking surface.
The magnetic material system used by the magnetic locking packaging box comprises the following components in percentage by weight:
10 to 20 percent of high molecular resin,
70 to 90 percent of ferrite magnetic powder,
1 to 10 percent of reinforcing fiber,
1% -5% of a lubricant.
And (3) mixing and granulating by using a double-screw extruder according to the proportion to obtain the high-strength and weak-magnetism polymer-based ferrite magnetic composite material for the magnetic locking packaging box, and performing injection molding, orientation and magnetization to obtain the box body and the box cover of the magnetic locking packaging box.
Further, the polymer material of the present invention may be polyamide 6, polyamide 12, polyamide 66, polypropylene, polyethylene, or other resin; the grain size d50 of the micron-sized ferrite powder is less than or equal to 5 mu m, wherein the magnetic powder is subjected to surface treatment by using a coupling agent; the reinforcing fiber can be chopped glass fiber or chopped carbon fiber; the coupling agent is a silane coupling agent or a titanate coupling agent, and the using amount of the coupling agent accounts for 0.5-2% of the mass of the magnetic powder.
Furthermore, the magnetic locking packaging box comprises a box cover and a box body, and the box cover and the box body are respectively magnetized in an oriented way in the injection molding process and are magnetized along the direction vertical to the locking surface, so that the attraction force of the box cover and the box body on the attraction surface is ensured to be enough.
The process comprises the following steps:
(1) magnetic powder treatment
Respectively dissolving 0.8 part of coupling agent in a proper amount of deionized water, wherein the use amount of the deionized water is limited by the fact that the magnetic powder can be completely coated; and then adding the powder into 100 parts of micron ferrite magnetic powder, stirring and activating at the temperature of 50-60 ℃, and then drying for 4-6 hours at the temperature of 100 ℃ to obtain the activated ferrite magnetic powder.
(2) Mixing and granulating
The formula of claim 1, wherein the polymer-based ferrite magnetic composite material used for the magnetic locking packaging box is obtained by uniformly mixing the polymer resin, the reinforcing fiber, the lubricant and the activated ferrite magnetic powder, and performing extrusion granulation by using a double-screw extruder at the temperature of 200-260 ℃.
(3) Injection moulding
Performing injection molding and electromagnetic field orientation on the polymer-based ferrite magnetic composite material prepared in the step 2, wherein the orientation field strength is 0.5-2T; the barrel temperature of the injection molding machine is set to be 250-280 ℃, and the mold temperature is set to be 60-80 ℃.
Compared with the prior art, the magnetic locking packaging box and the magnetic material system used by the same have the following advantages:
firstly, the invention utilizes the magnetic composite material prepared by a high-strength and weak-magnetism system, can obtain the box body and the box cover of the packing box after one-time injection molding and orientation magnetization, avoids the situation that a common plastic box body is assembled with a strong-magnetism metal magnetic ring, and reduces the original secondary assembly process.
Secondly, the magnetic material system is adopted to mix the polymer resin and the ferrite magnetic powder, so that the method is safe and environment-friendly, has low cost and saves rare earth resources; besides, the problems of pollution of the metal magnetic medium to products in the packaging box and easy corrosion of the metal magnet can be avoided.
Thirdly, the box cover and the box body are prepared by adopting a polymer-based ferrite magnetic composite material system with weaker magnetism, and the magnetizing direction of the box cover and the box body is vertical to the cross section direction of the box body, so that stronger magnetic force is realized in the attracting direction, and stronger locking force can be ensured; the box body has weaker magnetism, and can not generate stronger magnetic field to generate magnetic radiation to surrounding articles.
Compared with the existing magnetic packaging box system, the magnetic locking packaging box system prepared by the invention has the advantages of convenient forming and processing and low cost, and can meet the requirements of most packaging boxes.
Detailed description of the preferred embodiments
The present invention will be described in more detail with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1.
A preparation method of a polyamide 6/ferrite magnetic composite material for a magnetic locking structure packaging box comprises the following raw materials in parts by mass:
10 percent of polyamide 6 resin,
85 percent of micron ferrite (d 50 is less than or equal to 5 mu m),
4 percent of chopped glass fiber,
The process comprises the following steps:
(1) magnetic powder treatment
Respectively dissolving 0.8 part of coupling agent in a proper amount of deionized water, wherein the use amount of the deionized water is limited by the fact that the magnetic powder can be completely coated; and then adding the powder into 100 parts of micron ferrite magnetic powder, stirring and activating at the temperature of 50-60 ℃, and then drying for 6 hours at the temperature of 100 ℃ to obtain the activated ferrite magnetic powder.
(2) Mixing and granulating
The polyamide 6 resin, the micron-sized ferrite magnetic powder, the chopped glass fiber and the stearic acid are uniformly mixed according to the mass percentage of 10:85:4:1, and are extruded and granulated by a double-screw extruder at the temperature of 220-240 ℃ to obtain the polyamide 6-based ferrite magnetic composite material used for the magnetic locking packaging box.
(3) Injection moulding
Performing injection molding and electromagnetic field orientation on the polymer-based ferrite magnetic composite material prepared in the step 2, wherein the orientation field strength is 0.5-2T; the barrel temperature of the injection molding machine is set to be 260-280 ℃, and the mold temperature is set to be 60-80 ℃.
The samples prepared in step 3 of this example were tested for performance according to the relevant standards and the results were as follows: br =0.30T, Hcj =320KA/m, (BH) max =12KJ/m 3; the tensile strength is 95.0MPa, the bending strength is 102.0MPa, and the impact strength is 25.5KJ/m 2; the melt index was 150g/10 min.
Example 2.
A preparation method of a polyamide 12/ferrite magnetic composite material for a magnetic locking structure packaging box comprises the following raw materials in parts by mass:
12 percent of polyamide 12 resin,
85 percent of micron ferrite (d 50 is less than or equal to 5 mu m),
2 percent of short-cut carbon fiber,
1% of polyamide wax.
The process comprises the following steps:
(1) magnetic powder treatment
Respectively dissolving 0.8 part of coupling agent in a proper amount of deionized water, wherein the use amount of the deionized water is limited by the fact that the magnetic powder can be completely coated; and then adding the powder into 100 parts of micron ferrite magnetic powder, stirring and activating at the temperature of 50-60 ℃, and then drying for 6 hours at the temperature of 100 ℃ to obtain the activated ferrite magnetic powder.
(2) Mixing and granulating
Uniformly mixing polyamide 12 resin, micron-sized ferrite magnetic powder, chopped carbon fiber and polyamide wax according to the mass percent of 12:85:2:1, and extruding and granulating at the temperature of 200-230 ℃ by using a double-screw extruder to obtain the polyamide 12-based ferrite magnetic composite material used for the magnetic locking packaging box.
(3) Injection moulding
Performing injection molding and electromagnetic field orientation on the polymer-based ferrite magnetic composite material prepared in the step 2, wherein the orientation field strength is 0.8T; the barrel temperature of the injection molding machine is set to be 250-270 ℃, and the mold temperature is set to be 60-80 ℃.
The samples prepared in step 3 of this example were tested for performance according to the relevant standards and the results were as follows: br =0.28T, Hcj =300KA/m, (BH) max =11.2KJ/m 3; the tensile strength is 75.0MPa, the bending strength is 90.0MPa, and the impact strength is 29.5KJ/m 2; the melt index was 180g/10 min.
Example 3.
A preparation method of a polypropylene/ferrite magnetic composite material for a magnetic locking structure packaging box comprises the following raw materials in parts by mass:
15 percent of polypropylene resin,
81 percent of micron ferrite (d 50 is less than or equal to 5 mu m),
3 percent of chopped glass fiber,
The process comprises the following steps:
(1) magnetic powder treatment
Respectively dissolving 0.8 part of coupling agent in a proper amount of deionized water, wherein the use amount of the deionized water is limited by the fact that the magnetic powder can be completely coated; and then adding the powder into 100 parts of micron ferrite magnetic powder, stirring and activating at the temperature of 50-60 ℃, and then drying for 6 hours at the temperature of 100 ℃ to obtain the activated ferrite magnetic powder.
(2) Mixing and granulating
Uniformly mixing polypropylene resin, micron-sized ferrite magnetic powder, chopped glass fiber and stearic acid according to the mass percentage of 15:81:3:1, and extruding and granulating at the temperature of 180-210 ℃ by using a double-screw extruder to obtain the polypropylene-based ferrite magnetic composite material for the magnetic locking packaging box.
(3) Injection moulding
Performing injection molding and electromagnetic field orientation on the polymer-based ferrite magnetic composite material prepared in the step 2, wherein the orientation field strength is 0.8T; the barrel temperature of the injection molding machine is set to be 230-250 ℃, and the mold temperature is set to be 60-80 ℃.
The samples prepared in step 3 of this example were tested for performance according to the relevant standards and the results were as follows: br =0.25T, Hcj =275KA/m, (BH) max =9.0KJ/m 3; the tensile strength is 80.0MPa, the bending strength is 94.0MPa, and the impact strength is 22.7KJ/m 2; the melt index was 142g/10 min.
Description of the drawings:
fig. 1 is a schematic diagram of a locking structure of a conventional magnetic locking packing box, wherein 1 is a cover made of a paramagnetic material, and 2 is a metal permanent-magnetic strong-magnetic material embedded in a plastic box body.
Fig. 2 is a schematic view of the magnetic field direction of the conventional magnetic locking packing box and the magnetic locking packing box designed by the invention. Wherein, the drawing a is a schematic view of the magnetic field direction of the locking structure of the conventional magnetic locking packaging box, and the drawing b is a schematic view of the magnetic field direction of the magnetic locking packaging box designed by the invention, wherein, 1 is a box cover with unidirectional weak magnetism prepared by polymer-based ferrite magnetic composite materials, and 2 is a box body with unidirectional weak magnetism prepared by polymer-based ferrite magnetic composite materials.
Claims (3)
1. A packaging box locked by magnetic force is characterized in that anisotropic permanent magnetic ferrite magnetic powder and high molecular resin are adopted to prepare a polymer-based ferrite magnetic composite material after being melted and mixed, and the packaging box cover and the box body with weak unidirectional magnetism are obtained after injection molding and orientation and are magnetized along the locking direction, but enough locking force can be generated in the locking direction after locking; wherein, the direction of magnetizing of lid and box body is perpendicular to locking surface direction:
(1) preparation of magnetic composite materials
Uniformly mixing the polymer resin, the activated ferrite magnetic powder, the reinforcing fiber and the lubricant according to a ratio, adding the mixture into a double-screw extruder, and extruding and granulating the mixture at the temperature of 220-310 ℃ to obtain a polymer-based ferrite magnetic composite material;
(2) injection moulding
And (2) performing injection molding, orientation and magnetization on the polymer-based ferrite magnetic composite material prepared in the step (1) to obtain a box cover and a box body with weak magnetism in one direction, wherein the orientation field strength is 0.5-2T, the barrel temperature of an injection molding machine is set to be 250-280 ℃, and the mold temperature is 60-80 ℃.
2. A magnetically-lockable packaging according to claim 1, wherein the magnetic composite comprises the following components in mass percent:
the sum of the above components is 100%.
3. A magnetically lockable packing container according to claim 1, wherein said polymeric resin is one of polyamide resin 6, polyamide resin 12, polypropylene (PP); the particle diameter d of the ferrite magnetic powder used50Not more than 5 μm, the magnetic powder is surface treated by silane coupling agent, the amount of which accounts for 0.5-2% of the mass of the magnetic powder; the reinforcing fiber is one of chopped glass fiber and chopped carbon fiber; the lubricant is one or a compound of stearic acid or polyamide wax.
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| CN109859923A (en) * | 2019-02-28 | 2019-06-07 | 滁州市博瑞特工贸有限公司 | A kind of preparation method of the dedicated magnetic stripe of refrigerator |
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| JP2001191387A (en) * | 2000-01-12 | 2001-07-17 | C I Kasei Co Ltd | Magnetic molded article |
| CN105585838A (en) * | 2016-01-18 | 2016-05-18 | 横店集团东磁股份有限公司 | Granular material for injection-molded nylon-12-permanent magnetic ferrite and preparation method of granular material |
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| JP2001191387A (en) * | 2000-01-12 | 2001-07-17 | C I Kasei Co Ltd | Magnetic molded article |
| CN105585838A (en) * | 2016-01-18 | 2016-05-18 | 横店集团东磁股份有限公司 | Granular material for injection-molded nylon-12-permanent magnetic ferrite and preparation method of granular material |
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| Title |
|---|
| 颗粒尺寸对注塑铁氧体/尼龙12复合材料流动性和磁性能的影响;肖恋 等;《磁性材料及器件》;20111231;第42卷(第6期);第51-56页 * |
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